21122220011212 has 6 divisors (see below), whose sum is σ = 36963885019628. Its totient is φ = 10561110005604.

The previous prime is 21122220011149. The next prime is 21122220011219. The reversal of 21122220011212 is 21211002222112.

It is a super-2 number, since 2×21122220011212² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122220011212.

It is not an unprimeable number, because it can be changed into a prime (21122220011219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2640277501398 + ... + 2640277501405.

Almost surely, 2^{21122220011212} is an apocalyptic number.

It is an amenable number.

21122220011212 is a deficient number, since it is larger than the sum of its proper divisors (15841665008416).

21122220011212 is a wasteful number, since it uses less digits than its factorization.

21122220011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280555002807 (or 5280555002805 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21122220011212 its reverse (21211002222112), we get a palindrome (42333222233324).

The spelling of 21122220011212 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty million, eleven thousand, two hundred twelve".